Underground

[FrighT MasteR]

Though not an entirely original premise, it still sounds decent:

http://www.upcominghorrormovies.com/movies/underground.php

[nickdecember18]

I like underground creature movie like The Descent and what's that British flick with the girl being left in the Subway station, I forgot the title, anyway, love both of those movies.

[Chief Falling Rock]

The movie your talkin about is called Creep. I personally am always up for a good monster movie. If the trailer ends up lookin good I'll give it a shot.